GitCode, a git-hosting website operated Chongqing Open-Source Co-Creation Technology Co Ltd and with technical support from CSDN and Huawei Cloud.
It is being reported that many users’ repository are being cloned and re-hosted on GitCode without explicit authorization.
There is also a thread on Ycombinator (archived link)
It depends on the software license.
Does it though? You can still put up a fork somewhere else as long as you uphold the license right? Unless I guess in the case where the license explicitly disallows forks, but I don’t think that’s very common (can you even do that?).
Most GitHub repos don’t have a license, meaning you are not licensed to do anything with them. Rehosting them would be the same as rehosting an image you don’t have a license for.
Forks are derivative works (quite obviously) so yes you can forbid them via license terms. Whether or not that’s still open source, take it up with OSI. I vaguely recall that at least once upon a time there was some project that required modification to the code to be published as separate patches and it was generally accepted to be open source don’t ask me which.